Keeping it clean

Sometimes you don't want to store the full value for later analysis. For example, an experiment may return IUser instances, but when researching a mismatch, all you care about is the logins. You can define how to clean these values in an experiment:

public IUser GetUserByEmail(string emailAddress)
{
    return Scientist.Science<IUser, string>("get-user-by-email", experiment =>
    {
        experiment.Use(() => OldApi.FindUserByEmail(emailAddress));
        experiment.Try(() => NewApi.GetUserByEmail(emailAddress));
        
        experiment.Clean(user => user.Login);
    });
}

And this cleaned value is available in the final published result:

public class MyResultPublisher : IResultPublisher
{
    public Task Publish<T, TClean>(Result<T, TClean> result)
    {
        // result.Control.Value = <IUser object>
        IUser user = (IUser)result.Control.Value;
        Console.WriteLine($"Login from raw object: {user.Login}");
        
        // result.Control.CleanedValue = "user name"
        Console.WriteLine($"Login from cleaned object: {result.Control.CleanedValue}");
        
        return Task.FromResult(0);
    }
}